Spark-plug.



distance, as .at (i, t1ius' "f 'oii'riiingfat` the upper end 'of-saidaprom'nninternal sholilder 7 L' UNITED STATES PATENT. OFFICE.

GEORGE T. SIMMONS, 0F lTAISI'ES-illld'ali, WISCONSIN.

SPARK-PLUG.

1b all whon it may concern:

Beit known that I, GEORGE .'1. Simmons, a

citizen of the United States, and a resident of Janesville, in the-county of Rock and 5 State of Wisconsin, have invented certain new andusefulv Improvements in Spark Plugs; and I do hereby declare thefellowing tobe a full, clear, and exact description of the invention,such as-will enable others skilled in the a'rt to which it=appertains tomake and use the same. h

This invention relates to improvements in spark plugs for internalcombustion engines,-.one object o fthe inventin being to provide asimple spark plug, which shall be so constructed as to eifeetiiallyprevent co1- lection of oil at the spark terminals.

A further object is to so construct a spark 'plug that the sparkingterminals shall be so constructed and disposed within an apron extensionof the plug casin as to prevent @creeping oil .from reaching t eparts'of said terminals between which the sparks are formed orgenerated.

invention consists in certain novel features -of construction andcombinaions of parts as hereinafter set forth and pointed out in theclaims.

In the accompanying drawin Figure 1 is a sectional view of a spark p ugembodying my invention, and Fig. 2 is a view of a modiication.

1 represents the casing of a spark plu having an internally threadedenlarge upper portion 2 'fortl1e accommodation of suitable retaining''means for the inner poreelain or insulated member 3 ofthe structure.".'lfhelower portion ofthe casing 1 is threaded as at 4v toscrew througha sult- 4al) peni g in the cylinderfhead of anin# te mbustion engines:Below the' threaded portion 4, the shelliis .meile with an.emulare-pron extension 5,:the wail of which ismade quite thin and1fqjsadapted to 4project u ix'iwfer'dlyV beyond the Aen 'ne cylinder.' 1

bove the upper lend of the 'apron 5, the hereof the casing 1 iscontracted lfor a short One of thefsp'arking terminals which, forconvenience maybe called the inner spark "ing @mimi ,8i-m55'. O11Sit of4a straight i a Wir-carried by the Pol'laln body 3.'. ofthe With theseand other objects in View, the

inner wallof the combustion-chamber lof they i Specification of LettersPatent.

Application led Gotcbcr 7, 1918. Serial No. 124408.

4free limb terminatin structure and depends therefrom centrally throughthe contracted bore 6 and the thin apron extension 5. y

The other sparking terminal which, for convenience may be referred to asthe outer sparking terminal 9, consists of a piece of wire secured atits upper end in 'a'suitable socket formed in the internal shoulder 7.The wire of this sparking terminal extends from the shoulder 7downwardly in a diagonal direction throu h the chamber formed by theapron 5 an at its lower end, said wire is bent upwardly to form a loop10, the free member 1.1 of which projects upwardly Within the chamber ofthe apron so as to be disposed in a substantially vertical position, andthe extremity of the vertical member 'il of said outer sparking terminalWire is bent laterally,`as at 112, so that its ex- Patented Feb. 5,1918.4

treni-ity shall be presented at right angles to the inner sparkingterminal 8 within the apron chamber. v f

' -From the above description, it will be seen that the wire of thesparking terminal 9 is not in contact with theV wallof the: apron butthat it projects away from said wall toward the center of theapronchamber and that its free limb or member 11 is so disposed andof suchlengthas to prevent the c1i1nbin vocii to its free extremity.

.he oil which'tinds its Way on the cylinder walls to the plug will, uponreaching the thin depending apron pass down 'the same and what is notconsumed will collect at the lower edge of said apron and at. eachfiring win be fm-Ced back ist these/imag, "Should the wall of the engineylinder lis-.very oily,

solne oil might find itsvway insidev the' apron and tend to creep up thesame, but with-my improved construction, wherein' the outer terminalwire de ends from al shoulder at th'e upper end of t e `apron andprojectsaway from the wall of the'apron, ivith a-vertical 'within andnearthe center of the apron `c ambenthe' cil would .have to travelupwardly on the aprongwa'll a considerable distance to reach the louterterminal wire,'and thisis not'liable to occur.

vShould any oil find its wa to the outer terinmal-Wire it would be wireon passing down it onv account of its length and should anyhappen toreach Lthe bottom of this loop lit .wouldjnotbe able to travel upwardlyalong' yhe free verticallimb 10 to the sparking point lillv f urned offthis rimi,l

Liie Instead of providingl an Aapron such. as

shown in Fig. 1 the Lhmzudlzd portion -L muy be extendud to thu, lowm'und ul' Suid casing; as shown in4 Fig. 2. 11i. [,liif; fmm of the invention, the casing is plovidml interimfly above its lower cm1 with imannular shoudul 13, to which 111m ontmlxwmiim wir@ 14: is secured, thv,Saune :is in the, conx struction Shown in Fig. 1. 'In Fig. 2, the loopedvnd l5 is shown uli.; being; curved thl'ougmui, and whiiy said ,imp isshown pray-.ating lwiow thu und of the Casi-ing, su'gil the free{,ui'mnui 1G is within the casing.

'Having fully dcamibed my invention what 1 claim as naw und dlilfu izosmiiii'v by Luttm's Patent, is1

1. A Spark Vping comprising 5L waging. au .'m suisiim mafnxmr Suppm'l'miin the, upper' purtiou uf said causing? smid musing lmvug :in infermi!shmildor )mami xbm-v, the icwr und thm'mf and bnlmw Smid. insulatornmmbei :md iis ammini-t. :111 inner vleunxw if tending below said immunishmlider und. spaced thcrefwm, sind an mitm' wir@ elec trod@ fixed atits u ppm1 and t0 said internal. shoulder and extnding downwardy and ini,zesmsov 'wmrdy thnel'ufaznn, wid outer wire electrode wrmnaiing maarHu: lower und ofthe zaSng :md in spzufking relation 'to said innerelectmde.

A Spark plug comprising a casing prof vidad nl'. its lower und with aninteg1'a1-d0- pmmling :ipi'on muliited to project-infn() the wmbuston.chamber of ma eixgiii, saidfcaf ing' having im imei-mil @houllrA ai; heupper end. of said upif0n,.zm inner elccfrd entering the chamber for-mm1by Suidv wending apron, and sin uiite Wc @Mahi-odo. fixed L0 Suidintm'ml shoulder mid projccting r'lownAwin'Ny helefxmu in i1 diugqnuldimi/:tion in the :1p1-un chamber :uid having milking n.emimi px'ojtingupwardly l iiiwm-lly toward the. inner electrode.

in t'. 'timouy .mwfw'f, I have signed ibis, sgic-,ciicuio .in thepresence of LWN Subsc-bib. ing wilnsss. i

GEORGE T. SIMMONS.

W i tn asses ARTIE AT1-IESE?, F.. L. CLEMONS.

